See: any of the other dozens of shows that were canceled before storylines were established. SGU got two seasons, which was a season more than i expected, even though I really liked the show from the beginning. I was sick of the formulaic approach SG-1 and Atlantis took. They were great shows, it had just started to get repetitive. I was ecstatic to see a different, more serious take, a more grown up show, but people wanted more of the same drivel.
Networks want flash-in-the-pot, make-a-lot-of-money-with-no-budget shows. Sadly, scripted dramas in general have fallen by the wayside in favor of shit that will sell whatever they're hocking. I'm 2 series away from canceling my cable altogether and focusing on Netflix/DVD/Blu-Ray releases.